Question: In what year Luzembourg had a population of 57822?
Paraphrase: When did Luzembourg have a population of 57822?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q1842 p:P1082 ?s . ?s ps:P1082 ?x filter(contains(?x , '57822.0')) . ?s pq:P585 ?value}